pradaxa may increase your bleeding risk if you're 75 or older, have kidney problems or a bleeding condition, like stomach ulcers. or if you take aspirin products, nsaids, or blood thinners. tell your doctor about all medicines you take, any planned medical or dental procedures, and don't stop taking pradaxa without your doctor's approval, as stopping may increase your stroke risk. other side effects include indigestion, stomach pain, upset, or burning. if you have afib not caused by a heart valve problem, ask your doctor if pradaxa can reduce your risk of a stroke.